1935 - Maroons sweep the Leafs

On April 9, 1935, the Montreal Maroons completed a three game sweep of the Toronto Maple Leafs and won the Stanley Cup. It was the second and last Stanley Cup victory for the Maroons, who'd previously defeated the Victoria Cougars in the 1926 Stanley Cup Finals.

Lawrence "Baldy" Northcott scored the game-winning goal in the second period.

1946 - Canadiens win 6th Stanley Cup

Peace had returned to the world following World War 2, and on April 9, 1946, the Montreal Canadiens got back to the business of harvesting Stanley Cup victories.

The Montreal Canadiens defeated the Boston Bruins in five games, their fourth victory coming on April 9. Maurice Richards led all scorers in the series with seven points, while Habs captain "Toe" Blake scored the game-winning goal.

1980 - A family affair

It's rare that an 8-4 playoff loss counts as historic, but that's precisely what occurred to the Hartford Whalers on April 9, 1980. Though the Whalers were pummeled mercilessly by the Montreal Canadiens in the second game of a preliminary round series that the Habs would sweep, it was a memorable contest for Gordie Howe and the Whalers.

First of all, Gordie Howe scored his 68th career playoff goal in this contest (good for 17th all time). It was his final goal as an NHL player:

Secondly, this game was the only contest in NHL history in which all three members of the Howe family - Gordie, and his sons Marty and Mark - all recorded a point in the same game.